Agreed. I dont know how some Sony games have DLSS (Death Stranding/GOW) and they only just started porting games to PC while MS has been doing it for almost five years and still doesnt support DLSS in many titles.
I admire day one PC gamepass releases, but lets do it right.
This has mostly to do with nVidia and the the agreements they settle.
Implementing DLSS is difficult and expensive. So usually nVidia sends a team of engineers to help optimize games for their tech.
AMD and Intel do the same with their GPUs and CPUs.
Recently nVidia in collaboration with Unity and Epic did release SDKs than are implemented with these games most recent versions.
This means that a lot of devs can implement DLSS faster and cheaper.
But it's not a magic bullet, because games that started development on an earlier build of Unity or UE4, might not be able to upgrade.
For example, Days Gone was done in UE4.11. So they either would have to do all the work to implement DLSS into UE 4.11.
Or update to UE 4.26. And this would also mean a lot of work.
Of course nVidia, AMD and Intel are always trying to find the biggest titles to sponsor.
And that's why nVidia went after God of War on PC.
But this also means that the studio has to accept having a bunch of external engineers tinkering with their engine.
Some studios might be reluctant to have other people see how their tech works. Or risk having technical problems by adding new tech.
I'm just saying that adding DLSS is not as easy as flipping switch.